Sagan spoke at the 1968 symposium on the chances of life elsewhere. He said the evidence was not persuasive that UFOs were alien craft, nor that none of them were, and later became one of the best-known sceptics of UFO claims.
On the record
The question is very much an open one, and it is certainly too soon to harden attitudes and make any permanent contentions on the subject.
Hearings
Testified alongside
J. Allen HynekJames E. McDonaldRobert L. HallJames A. HarderRobert M. L. Baker Jr.